This feedback is probably too late by now but I feel it must be worth it to someone. This is as of Beta 3 of Bullroarer before it went down today.
Pros of the Pre Imbued LIs from the Soliloquy of the Valar package:
1) For inexperienced players who don't know about legacies, pre-selected legacies can get them to a somewhat ok standing.
2) The legacies are max experience leveled with item experience so no need to have to dump experience into them until you start adding empowerments.
3) The Tactical Damage Rating/DPS Rating/Healing Rating/etc are maxed with Star-lits (31/31)
Cons of the Pre Imbued LIs from the Soliloquy of the Valar package:
1) They are STILL Second Age Legendary Items that are just renamed First Age. They are missing the extra passive on class items. (Apparently the devs are aware and hopefully will fix this)
2) Star-lits basically get WASTED on a guardian belt of any kind if you choose a belt. Don't choose a belt! Same with Minstrel Healing weapon. Choose DPS weapon instead.
3) You cannot select what weapon type you get so can't take advantage of racial bonus or class needs. i.e. a healing minstrel or a tank would want a sword for the tiny 1% parry chance. Instead, a healing minstrel gets a mace and no other options.
4) The legacy tiers on the items are the absolute LOWEST you can get. This means the tiers BEFORE imbue were Tier 1! This is horrid. The legacy tiers end up being Tier 47 when the weapon is done with its business. You will still need 252 scrolls of empowerment per LI to max the tiers out. A first ager with legacy tiers leveled to tier 6 before imbue ends up with Tier 52 legacies post imbue. That's 217 scrolls of empowerment to max out.
So in summary:
The only grind these pre imbued LIs save you is item experience and star-lit crystals. They actually INCREASE your scroll of empowerment grind.
Here's a pic of the mace I got on my Valar'd minstrel:
Here's the selector box:
